Ureseal Types

F Series Soft compressible seal which spreads compression over a large area, ideal for under fitting applications providing OD is not too large.   
MF Series Soft compressible seal, features same as above but with a smaller OD.   
S Series Soft compressible seal for general use, OD as standard sizes.   
SX series Soft compressible seal which features an extended entry creating an insulated and sealed result.  Suitable for an under fitting application.  Not suitable for use with Self Tapping Screws or any fastening which is driven down from the top.     
SXR series Hard semi rigid seal extended entry as SX series, recommended for use under fastening heads, pan or countersunk.
PK series Hard semi rigid seal extended entry as SXR series, recommended for use with Self Tapping Screws.